U.S. patent number 6,370,091 [Application Number 09/111,588] was granted by the patent office on 2002-04-09 for recording medium having multiple recording layers and method and apparatus for recording and reproducing information on the recording medium.
This patent grant is currently assigned to Pioneer Electronics Corporation. Invention is credited to Kazuo Kuroda.
United States Patent |
6,370,091 |
Kuroda |
April 9, 2002 |
Recording medium having multiple recording layers and method and
apparatus for recording and reproducing information on the
recording medium
Abstract
A recording method of information data which can prevent illegal
copy of information data of a multilayer disc to a single-layer
disc. A series of information data is divided into data blocks each
having a predetermined data capacity, the data blocks are
distributed and recorded to different recording layers of a
recording medium, and a jump instruction to designate a next
reading destination is recorded in at least one of the data
blocks.
Inventors: |
Kuroda; Kazuo (Tokorozawa,
JP) |
Assignee: |
Pioneer Electronics Corporation
(Tokyo, JP)
|
Family
ID: |
16124710 |
Appl.
No.: |
09/111,588 |
Filed: |
July 7, 1998 |
Foreign Application Priority Data
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Jul 8, 1997 [JP] |
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9-182803 |
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Current U.S.
Class: |
369/30.08;
369/94; G9B/20.002; G9B/27.012; G9B/27.019; G9B/27.033;
G9B/7.033 |
Current CPC
Class: |
G11B
20/00615 (20130101); G11B 27/034 (20130101); G11B
27/105 (20130101); G11B 27/3027 (20130101); G11B
7/00736 (20130101); G11B 20/00086 (20130101); G11B
7/08511 (20130101); G11B 20/1217 (20130101); G11B
2220/2562 (20130101); G11B 7/24038 (20130101) |
Current International
Class: |
G11B
27/034 (20060101); G11B 7/007 (20060101); G11B
27/031 (20060101); G11B 20/00 (20060101); G11B
27/10 (20060101); G11B 27/30 (20060101); G11B
20/12 (20060101); G11B 017/22 () |
Field of
Search: |
;369/32,94,54,58,47,275.1,283,284,286 ;380/201,203 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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A2 0 426 409 |
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May 1991 |
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EP |
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A1 0 696 798 |
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Feb 1996 |
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EP |
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A2 0 751 517 |
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Jan 1997 |
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EP |
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A2 0 762 397 |
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Mar 1997 |
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EP |
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Other References
Patent Abstracts of Japan, vol. 097, No. 007, Jul. 31, 1997 &
JP 09 069264 A (Matsushita Electric Ind Co Ltd) Mar. 11, 1997
*Abstract..
|
Primary Examiner: Dinh; Tan
Attorney, Agent or Firm: Sughrue Mion, PLLC
Claims
What is claimed is:
1. A recording method of recording continuous information data onto
a recording medium having a plurality of recording layers,
comprising:
dividing said continuous information data into a plurality of data
blocks; and
distributing and recording said data blocks into the different
recording layers of said recording medium,
wherein at least a first data block of said data blocks recorded in
one of said different recording layers includes a jump instruction
to designate a next reading destination in another one of said
different recording layers.
2. A method according to claim 1, wherein the recording layers of
said recording medium comprise a first recording layer and a second
recording layer, a group of odd number designated blocks among said
data blocks is recorded into said first recording layer, and a
group of even number designated blocks among said data blocks is
recorded into said second recording layer.
3. A recording apparatus for recording continuous information data
onto a recording medium having a first recording layer and a second
recording layer, comprising:
a data dividing circuit for dividing said continuous information
data into a plurality of data blocks, obtaining a first data block
group containing data blocks selected from said data blocks as
information data for recording in the first layer, and obtaining a
second data block group containing data blocks among said data
blocks as information data for recording in the second layer;
and
a recording device that records said information data for recording
in the first layer into said first recording layer and recording
said information data for recording in the second layer into said
second recording layer,
wherein said data dividing circuit adds a jump instruction to a
first data block to be recorded in one of said first recording
layer and said second recording layer, and
wherein said jump instruction designates a next reading destination
to at least a second data block of said data blocks recorded in an
another one of said first recording layer and said second recording
layer.
4. An apparatus according to claim 3, wherein said first data group
contains consists odd-numbered data blocks among said data blocks,
and said second data group contains even-numbered data blocks among
said data blocks.
5. A recording medium having a first recording layer and a second
recording layer, wherein
a plurality of data blocks indicative of continuous information
data are distributed and recorded in said first recording layer and
said second recording layer, and a jump instruction to designate a
next reading destination, which is in one of said first recording
layer and said second recording layer, wherein said jump
instruction has been recorded in at least one of said data blocks
recorded in another one of said first recording layer and said
second recording layer.
6. A method according to claim 1, wherein, when said continuous
information data is reproduced from said recording medium, said
jump instruction causes a reproduction of said first data block to
automatically jump to a reproduction of a second data block in said
other one of said different recording layers without
interruption.
7. A method according to claim 6, wherein said plurality of data
blocks recorded in said different recording layers are continuously
reproduced without interruption such that said continuous
information data is reproduced without interruption.
8. An apparatus according to claim 3, wherein, when said continuous
information data is reproduced from said recording medium, said
jump instruction causes a reproduction of said first data block to
automatically jump to a reproduction of said second data block
without interruption.
9. An apparatus according to claim 8, wherein said first data block
group and said second data block group are continuously reproduced
without interruption such that said continuous information data is
reproduced without interruption.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of recording information
data to a recording medium.
2. Description of Related Art
As a type of DVD (digital versatile disk) that is an optical
recording medium, there is what is known as DVD-ROM (read only
memory) which has recording surfaces in two layers on one disc. In
a DVD-ROM, movie software, computer data, or the like having a
capacity on the maximum of 8.5 gigabytes is recorded and such a
DVD-ROM is provided for the use of general user.
Besides read-only type discs such as the DVD-ROM, other types of
DVD, i.e., DVD-R in which information data can be written only once
by a user, and DVD-RAM in which written information data can be
rewritten are being put to practical use.
In manufacturing a DVD recorder for recording information data on
the DVD-RAM or the DVD-R, a method for preventing illegal copy of
the contents of a DVD-ROM in which video software is recorded is
desired.
SUMMARY AND OBJECTS OF THE INVENTION
It is, therefore, an object of the invention to provide an
information data recording method which can prevent illegal copy of
information data recorded in a multilayer disc.
According to the invention, there is provided a recording method of
recording a series of information data into a recording medium
having a plurality of recording layers, comprising the steps of:
dividing the information data into data blocks each having a
predetermined data capacity, distributing and recording each data
block into the different recording layers of the recording medium;
and recording a jump instruction for designating a next reading
destination into at least one of the data blocks.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagram showing the construction of a master recording
apparatus for recording information to a recording disc on the
basis of a recording method according to the invention;
FIG. 2 is a diagram showing an example of an operation flow for
performing a data separating operation;
FIGS. 3A to 3C are diagrams showing an example of information data
and separated information data for first and second recording
layers;
FIG. 4 is a diagram showing jump destination addresses by jump
instructions JA.sub.1 to JA.sub.5 ;
FIG. 5 is a diagram showing an example of a recording format of a
DVD-ROM;
FIGS. 6 and 7 are diagrams showing recording directions of
recording layers in a parallel track system and an opposite track
system;
FIG. 8 is a flowchart showing a data separating operation which is
performed when information data is recorded onto a recording disc
by the opposite track system;
FIG. 9 is a diagram showing jump destination addresses of the jump
instructions JA.sub.1 to JA.sub.5 which are generated when
information data is recorded onto the recording disc by the
opposite track system;
FIG. 10 is a diagram showing an example of a recording format of a
DVD-ROM to which information data has been recorded by the opposite
track system;
FIG. 11 is a diagram showing another example of a recording format
of a DVD-ROM to which information data has been recorded by the
opposite track system; and
FIG. 12 is a diagram showing another example of a recording format
of the DVD-ROM to which information data has been recorded by the
opposite track system.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 is a diagram showing a construction of a master recording
apparatus for recording a pit train having information data such as
video software or the like onto two glass mother discs
(hereinafter, referred to as a first recording mother disc 20 and a
second recording mother disc 21) for transferring the pit train to
a DVD-ROM having recording surfaces of two layers on based on a
recording method of the invention.
In FIG. 1, a data dividing circuit 10 first divides information
data supplied so as to be recorded to the first recording mother
disc 20 corresponding to a first recording layer of a DVD-ROM into
data blocks each having a predetermined capacity and adds a jump
instruction for jumping a reproducing head of a reproducing
apparatus (DVD player) which is not shown to the end of each of the
data blocks. In the jump instruction, an address showing a jump
destination of the reproducing head is also set. The data dividing
circuit 10 further divides the data block series to which the jump
instructions were added as mentioned above into two groups of an
odd number designated data block group and an even number
designated data block group. The data dividing circuit 10 writes
the odd number designated data block group as information data for
the first recording layer into a data memory 11 for recording the
first layer and the even number designated data block group as
information data for the second recording layer into a data memory
12 for recording the second layer.
FIG. 2 is a diagram showing an example of an operation flow for
performing the data separating operation as mentioned above. The
operation flow is performed by a CPU (not shown) for controlling
the data dividing circuit 10.
In FIG. 2, first, the CPU stores a recording start address AD10 in
the first recording layer of the DVD-ROM and a recording start
address AD20 in the second recording layer into registers L1 and L2
(not shown) built in the CPU, respectively (step S31).
Subsequently, the CPU reads information data supplied to be
recorded onto the recording mother disc 20 every data block of the
predetermined capacity and stores it into a register Y (not shown)
(step S32). The CPU discriminates whether EOF indicative of the end
position of the information data exists in the fetched data block
or not (step S33). When it is determined in step S33 that the EOF
does not exist, the CPU discriminates whether the data block
fetched into the register Y is the odd number block or not (step
S34).
When it is determined that it is the odd number block in step S34,
a flag "1" indicative of the odd number block is stored into a flag
resistor F (not shown) (step S35). Subsequently, the CPU generates
a jump instruction JA to an address position (address position on
the first recording layer) stored in the register L1 (step S36).
The CPU reads out the data block fetched into the register Y and
stores the data block in which the jump instruction JA was added to
the end into the data memory 11 for recording the first layer (step
S37). The CPU overwrites and stores a new address obtained by
adding a block data capacity B of one data block including the jump
instruction JA to the address stored in the register L1 into the
register L1 (step S38). After completion of step S38, the CPU
returns to the execution of step S32.
On the other hand, when it is determined in step S34 that the data
block fetched in the register Y is not the odd number block, the
CPU stores a flag "0" indicative of the even number block into the
flag register F (step S39). The CPU generates the jump instruction
JA to an address position (address position on the second recording
layer) stored in the register L2 (step S40). The CPU reads out the
data block fetched in the register Y and stores the data block in
which the jump instruction JA was added to the end into the data
memory 12 for recording the second layer (step S41). Subsequently,
the CPU overwrites and stores a new address obtained by adding the
block data capacity B of one data block including the jump
instruction JA to the address stored in the register L2 into the
register L2 (step S42). After completion of step S42, the CPU
returns to the execution of step S32.
When it is determined in step S33 that the EOF indicative of the
end position of the information data exists in the data block
stored in the register Y, the CPU discriminates whether the storage
contents of the flag register F indicate the flag "1" or not (step
S43). When it is determined in step S43 that the storage contents
of the flag register F indicate the flag "1", the CPU stores the
EOF indicative of the end position of the information data into the
data memory 11 for recording the first layer (step S44). On the
other hand, when it is determined in step S43 that the storage
contents of the flag register F do not show the flag "1", the CPU
stores the EOF indicative of the end position of the information
data into the data memory 12 for recording the second layer (step
S45). When either step S44 or S45 is finished, the CPU exits the
data separation flow and returns to the execution of a main routine
(not described).
FIG. 3 is a diagram showing an example of the separation result of
the information data executed by the operation flow.
That is, when an information data series as shown in FIG. 3A is
supplied to the data dividing circuit 10, the data dividing circuit
10 divides the information data into data blocks D.sub.1 to D.sub.6
each having a predetermined data capacity and sequentially fetches
them on a data block unit basis. Subsequently, the data dividing
circuit 10 divides the data blocks D.sub.1 to D.sub.6 into odd
number designated data blocks D.sub.1, D.sub.3, and D.sub.5 and the
even number designated data blocks D.sub.2, D.sub.4, and D.sub.6.
The data dividing circuit 10 adds jump instructions JA.sub.1,
JA.sub.3, and JA.sub.5 (which will be described later) to the ends
of the odd number data blocks D.sub.1, D.sub.3, and D.sub.5,
respectively, and connects them, thereby forming information data
for the first recording layer. In this instance, the capacity of
each data block including the jump instruction is equal to the
block data capacity B as mentioned above. The data dividing circuit
10 adds jump instructions JA.sub.2, and JA.sub.4 (which will be
described later) to the ends of the even number data blocks
D.sub.2, D.sub.4, and D.sub.6, (except the last data block D.sub.6)
as shown in FIG. 3(C), respectively, and connects them, thereby
obtaining information data for the second recording layer. In this
case, the capacity of each data block including the jump
instruction is equal to the block data capacity B.
FIG. 4 is a diagram showing the jump destination addresses
indicated by the jump instructions JA.sub.1 to JA.sub.5.
As shown in FIG. 4, the jump destination address by the jump
instruction JA.sub.1 which is added to the end of the data block
D.sub.1 is the address AD20 showing the recording start position
for the second recording layer of the DVD-ROM. That is, in the
reproducing operation, the jump instruction JA.sub.1 is an
instruction to jump the pickup from the first recording layer of
the DVD-ROM to the address AD20 of the second recording layer. The
address AD20 shows the head position of the data block D.sub.2 on
the DVD-ROM. The jump destination address by the jump instruction
JA.sub.2 which is added to the end of the data block D.sub.2 is an
address AD11 obtained by adding the block data capacity B to the
address AD10 showing the recording start position for the first
recording layer of the DVD-ROM. That is, in the reproducing
operation by the reproducing apparatus, the jump instruction
JA.sub.2 is an instruction to jump the pickup from the second
recording layer of the DVD-ROM to the address AD11 of the first
recording layer. The address AD11 shows the head position of the
data block D.sub.3 on the DVD-ROM. The jump destination address by
the jump instruction JA.sub.3 which is added to the end of the data
block D.sub.3 is an address AD21 obtained by adding the block data
capacity B to the address AD20. That is, in the reproducing
operation by the reproducing apparatus, the jump instruction
JA.sub.3 is an instruction to jump the pickup from the first
recording layer of the DVD-ROM to the address AD21 of the second
recording layer. The address AD21 shows the head position of the
data block D.sub.4 on the DVD-ROM. The jump destination address by
the jump instruction JA.sub.4 which is added to the end of the data
block D.sub.4 is an address AD12 obtained by adding the block data
capacity B to the address AD11. That is, in the reproducing
operation by the reproducing apparatus, the jump instruction
JA.sub.4 is an instruction to jump the pickup from the second
recording layer of the DVD-ROM to the address AD12 of the first
recording layer. The address AD12 shows the head position of the
data block D.sub.5 on the DVD-ROM. The jump destination address by
the jump instruction JA.sub.5 which is added to the end of the data
block D.sub.5 is an address AD22 obtained by adding the block data
capacity B to the address AD21. That is, in the reproducing
operation by the reproducing apparatus, the jump instruction
JA.sub.5 is an instruction to jump the pickup from the first
recording layer of the DVD-ROM to the address AD22 of the second
recording layer. The address AD22 shows the head position of the
data block D.sub.6 on the DVD-ROM.
The information data for the first recording layer and the
information data for the second recording layer having the formats
as mentioned above are written into the data memory 11 for
recording the first layer and the data memory 12 for recording the
second layer, respectively.
When a recording start instruction is supplied from a control
circuit 17, the data dividing circuit 10 sequentially reads out the
information data for the first recording layer as shown in FIG. 3B
from the data memory 11 for recording the first layer and supplies
to a recording data encoder 13.
The recording data encoder 13 (8/16)-modulation encodes the
information data supplied from the data dividing circuit 10,
thereby generating an (8/16)-modulation signal. Subsequently, the
recording data encoder 13 converts the (8/16)-modulation signal
into a binary serial signal and supplies it as a recording signal
to a recording head 14. A slider mechanism 15 moves the recording
head 14 to the position on the DVD-ROM according to a recording
position signal which is supplied from the control circuit 17. The
recording head 14 irradiates a recording beam of a light amount
according to the recording signal supplied from the recording data
encoder 13 onto the recording mother disc 20 which is rotated by a
spindle motor 16, thereby recording the recording signal.
After completion of the whole recording of the recording signal
based on the information data for the first recording layer to the
first recording mother disc 20, the recording mother disc 20 is
exchanged to the second recording mother disc 21 to which the
recording signal based on the information data for the second
recording layer should be recorded. After that, the data dividing
circuit 10 sequentially reads out the information data for the
second recording layer as shown in FIG. 3C from the data memory 12
for recording the second layer and supplies it to the recording
data encoder 13. The recording data encoder 13 generates the
recording signal as mentioned above based on the supplied
information data and supplies it to the recording head 14. The
recording head 14 irradiates the recording beam of the light amount
according to the supplied recording signal onto the recording
mother disc 21, thereby recording the recording signal based on the
information data for the second recording layer.
By executing an electroforming process or the like to each of the
first recording mother disc 20 and second recording mother disc 21
on which the recording signals were recorded as mentioned above, a
stamper for the first recording layer and a stamper for the second
recording layer are manufactured, respectively. A half mirror film
is sputtered onto the disc for the first recording layer formed by
the stamper for the first recording layer. A high reflecting film
is sputtered onto the disc for the second recording layer formed by
the stamper for the second recording layer. Both discs are adhered,
thereby completing a DVD-ROM having the recording surfaces of two
layers.
A more detailed manufacturing method of the DVD-ROM having the
recording surfaces of two layers has been disclosed, for example,
in Japanese Patent Kokai No. 8-96406 (JP-A-8-96406).
FIG. 5 is a diagram showing a recording format of information data
on the DVD-ROM having the recording surfaces of two layers
manufactured by the method as mentioned above from the first
recording mother disc 20 and second recording mother disc 21 when
the information data for the first and second recording layers
shown in FIGS. 3B and 3C are recorded onto the first recording
mother disc 20 and second recording mother disc 21.
As shown in FIG. 5, the information data for the first recording
layer shown in FIG. 3B is sequentially recorded from the position
of the address AD10 in the first recording layer of the DVD-ROM.
Similarly, the information data for the second recording layer
shown in FIG. 3C is sequentially recorded from the position of the
address AD20 in the second recording layer of the DVD-ROM.
When the DVD-ROM having the above recording format is loaded to a
DVD player and the reproducing operation is started, the pickup of
the DVD player first starts to read the information from the
position of the address AD10. That is, the DVD player reproduces
the data block D.sub.1 and generates its reproduction signal.
When the reproduction of the data block D.sub.1 is finished, the
pickup of the DVD player reads the jump instruction JA.sub.1. In
this instance, as shown in FIG. 4, the jump instruction JA.sub.1 is
an instruction to jump the pickup to the position of the address
AD20. The pickup of the DVD player, therefore, jumps to the
position of the address AD20 in the second recording layer of the
DVD-ROM in response to the jump instruction and restarts the
ordinary reading operation from this position. That is, in this
instance, the DVD player reproduces the data block D.sub.2 and
generates its reproduction signal.
When the reproduction of the data block D.sub.2 is finished, the
pickup of the DVD player reads the jump instruction JA.sub.2. In
this instance, as shown in FIG. 4, the jump instruction JA.sub.2 is
an instruction to jump the pickup to the position of the address
AD11. The pickup of the DVD player, therefore, jumps to the
position of the address AD11 in the first recording layer of the
DVD-ROM in response to the jump instruction and restarts the
ordinary reading operation from this position. That is, in this
instance, the DVD player reproduces the data block D.sub.3 and
generates its reproduction signal.
It is assumed that the second layer recording start address AD20 is
an address which is located on the disc outer periphery rather than
the first layer recording start address AD10 and on the disc inner
periphery rather than the address AD11.
When the reproduction of the data block D.sub.3 is finished, the
pickup of the DVD player reads the jump instruction JA.sub.3. In
this instance, as shown in FIG. 4, the jump instruction JA.sub.3 is
an instruction to jump the pickup to the position of the address
AD21. The pickup of the DVD player, therefore, jumps to the
position of the address AD21 in the second recording layer of the
DVD-ROM in response to the jump instruction and restarts the
ordinary reading operation from this position. That is, in this
instance, the DVD player reproduces the data block D.sub.4 and
generates its reproduction signal.
When the reproduction of the data block D.sub.4 is finished, the
pickup of the DVD player reads the jump instruction JA.sub.4. In
this instance, as shown in FIG. 4, the jump instruction JA.sub.4 is
an instruction to jump the pickup to the position of the address
AD12. The pickup of the DVD player, therefore, jumps to the
position of the address AD12 in the first recording layer of the
DVD-ROM in response to the jump instruction and restarts the
ordinary reading operation from this position. That is, in this
instance, the DVD player reproduces the data block D.sub.5 and
generates its reproduction signal.
When the reproduction of the data block D.sub.5 is finished, the
pickup of the DVD player reads the jump instruction JA.sub.5. In
this instance, as shown in FIG. 4, the jump instruction JA.sub.5 is
an instruction to jump the pickup to the position of the address
AD22. The pickup of the DVD player, therefore, jumps to the
position of the address AD22 in the second recording layer of the
DVD-ROM in response to the jump instruction and restarts the
ordinary reading operation from this position. That is, in this
instance, the DVD player reproduces the data block D.sub.6 and
generates its reproduction signal.
The embodiment is adapted to what is called a parallel track system
such that the recording track on each of the recording surfaces of
two layers of the DVD-ROM is directed from the disc's inner rim to
the outer rim as shown by hatched arrows in FIG. 6.
In the invention, however, as shown by hatched arrows in FIG. 7,
the invention can be also applied to an opposite track system such
that the recording tracks on the recording surfaces of two layers
are formed toward the different directions.
FIG. 8 is a diagram showing an example of a data separating flow
made in consideration of the above point.
The data separating flow is executed by a CPU to control the data
dividing circuit 10 in a manner similar to that shown in FIG.
2.
In FIG. 8, the CPU first stores the initial jump destination
address AD21 into the register L1 built in the CPU (step S51). The
CPU reads the information data supplied so as to be recorded onto
the recording mother disc every data block as much as a
predetermined capacity and stores it into the register Y (step
S52). The CPU subsequently discriminates whether the EOF indicative
of the end position of the information data exists in the fetched
data block or not (step S53). When it is determined in step S53
that no EOF exists, the CPU discriminates whether the data block
fetched into the register Y is the odd number designated block or
not (step S54).
In step S54, when it is decided that the data block is the odd
number designated block, the CPU stores a flag "1", indicative of
the odd block into the flag register F (step S55). The CPU
subsequently forms the jump instruction JA to the address position
(address position on the first recording layer) stored in the
register L1 (step S56). The CPU reads out the data block fetched
into the register Y and stores the data obtained by adding the jump
instruction JA to the end of the data block into the data memory 11
for recording the first layer (step S57). The CPU overwrites and
stores the new address obtained by adding the block data capacity B
of one data block including the jump instruction JA to the address
stored in the register L1 into the register L1 (step S58). After
the end of step S58, the CPU is returned to the execution of step
S52.
When it is determined in step S53 that the data block fetched in
the register Y is not the odd block, the CPU stores a flag "0"
indicative of the even number designated block into the flag
register F (step S59). The CPU reads out the address stored in the
register L1 and generates the jump instruction JA to the address
position (address position on the second recording layer)
represented by a complement value of the address (step S60). For
example, when the address stored in the register L1 is "00FF"
(HEX), since the complement value of the address is "FF01" (HEX),
the jump instruction JA to jump the pickup to the address position
shown by the complement value is generated. The CPU reads out the
data block fetched in the register Y and stores the data obtained
by adding the jump instruction JA to the end of the data block into
the data memory 12 for recording the second layer (step S61). After
the end of step S61, the CPU is returned to the execution of step
S52.
In step S53, when it is determined that the EOF showing the end
position of the information data exists in the data block stored in
the register Y, the CPU discriminates whether the storage contents
of the flag register F indicates the flag "1" or not (step S62). In
step S62, when it is decided that the storage contents of the flag
register F indicate the flag "1", the CPU stores the EOF showing
the end position of the information data into the data memory 11
for recording the first layer (step S63). In step S62, when it is
determined that the storage contents of the flag register F do not
indicate the flag "1", the CPU stores the EOF showing the end
position of the information data into the data memory 12 for
recording the second layer (step S64). When either step S63 or S64
is finished, the CPU exits the data separating flow and is returned
to the execution of the main routine (which is not explained).
By the execution of the data separating flow, the information data
for the first recording layer and the information data for the
second recording layer are stored in the formats shown in FIGS. 3B
and 3C into the data memory 11 for recording the first layer and
the data memory 12 for recording the second layer, respectively. In
case of recording the information data, however, by the opposite
track system as mentioned above, the jump destination address by
each of the jump instructions JA.sub.1 to JA.sub.5 is as shown in
FIG. 9.
The operation when the information data for the first recording
layer and the information data for the second recording layer are
recorded onto the first and second recording mother discs by the
opposite track system will now be described. When executing the
recording, first, the data dividing circuit 10 sequentially reads
out the information data for the first recording layer as shown in
FIG. 3B from the head block from the data memory 11 for recording
the first layer and supplies it to the recording data encoder 13.
In accordance with the operation as shown in FIG. 10, the recording
head 14 sequentially records the recording signal corresponding to
each of the information data D.sub.1, JA.sub.1, D.sub.3, JA.sub.3,
and JA.sub.5 for the first recording layer from the position of the
predetermined address AD10 in the first recording layer of the
DVD-ROM in the direction of disc's outer rim.
When the recording to the first recording layer is finished, the
recording mother disc 20 is exchanged to the second recording
mother disc 21. After that, the data dividing circuit 10
sequentially reads out the information data for the second
recording layer as shown in FIG. 3B from the last block from the
data memory 12 for recording the second layer and supplies it to
the recording data encoder 13. In accordance with this operation,
as shown in FIG. 10, the recording head 14 sequentially records the
recording signal corresponding to each of the information data
D.sub.6, EOF, D.sub.4, JA.sub.4, D.sub.2, and JA.sub.2 for the
second recording layer from the position of the address AD20 in the
second recording layer of the DVD-ROM in the direction of disc's
inner rim.
When the DVD-ROM having the recording format as shown in FIG. 10 is
loaded into the DVD player and the reproducing operation is
started, the pickup of the DVD player first starts to read the
information from the position of the address AD10 in the first
recording layer. That is, the DVD player reproduces the data block
D.sub.1 and generates its reproduction signal. When the
reproduction of the data block D.sub.1 is finished, the pickup of
the DVD player reads the jump instruction JA.sub.1. In this
instance, as shown in FIG. 9, the jump instruction JA.sub.1 is an
instruction to jump the pickup to the position of the address AD21.
In response to the jump instruction, therefore, the pickup of the
DVD player jumps to the position of the address AD21 in the second
recording layer of the DVD-ROM and starts the reading operation
toward the disc's inner rim direction from that point. That is, in
this case, the DVD player reproduces the data block D.sub.2 and
generates its reproduction signal. When the reproduction of the
data block D.sub.2 is finished, the pickup of the DVD player reads
the jump instruction JA.sub.2. In this instance, as shown in FIG.
9, the jump instruction JA.sub.2 is an instruction to jump the
pickup to the position of the address AD11. In response to the jump
instruction, therefore, the pickup of the DVD player jumps to the
position of the address AD11 in the first recording layer of the
DVD-ROM and starts the reading operation toward the disc outer rim
direction from here. In this instance, that is, the DVD player
reproduces the data block D.sub.3 and generates its reproduction
signal.
After that, while the pickup of the DVD player similarly jumps
between the first recording layer and the second recording layer in
response to the jump instruction JA read out from the DVD-ROM, the
pickup sequentially reads and reproduces the information data
D.sub.4 to D.sub.6 by repeating the reversal (disc inner rim
direction/outer rim direction) of the reading direction.
In the recording format shown in FIG. 10, the odd blocks in the
information data are recorded into the first recording layer and
the even blocks are recorded into the second recording layer. The
invention, however, is not limited to the above recording
format.
For instance, as shown in FIG. 11, it is also possible to record
only the data block D.sub.2 and jump instruction JA.sub.2 into the
second recording layer and to sequentially record the other data
blocks into the first recording layer. In this instance, although
the jump instruction JA.sub.1 showing the jump destination to the
head position of the data block D.sub.2 is added to the end of the
data block D.sub.1, there is no need to add the jump instruction to
the end of each of the other data blocks D.sub.3 to D.sub.5. That
is, in FIG. 11, the jumping operation between the first and second
recording layers is executed in only the head portions (data blocks
D.sub.1, D.sub.2) of the information data blocks. As shown in FIG.
12, if only the head data block D.sub.1 in the information data is
recorded into the second recording layer and the other data blocks
are continuously recorded into the first recording layer, it is
sufficient to use only one jump instruction (jump instruction
JA.sub.1). According to the recording format shown in FIG. 11, the
reading start position of the information data is set to the
address AD21 of the second recording layer and the jump destination
address by the jump instruction JA.sub.1 is set to the address AD10
of the first recording layer.
In the embodiment, although the method of recording to the
recording disc having only two recording layers has been described,
the invention can be also applied to a multilayer disc having three
or more recording layers.
In the recording method according to the invention as mentioned
above, when a series of information data such as movie software is
recorded to the multilayer disc having a plurality of recording
surfaces, the information data is divided into a plurality of data
blocks of every predetermined data capacity and those data blocks
are distributed and recorded into the respective recording layers.
Further, a jump instruction showing the next reading destination is
additionally recorded to at least one of the data blocks. The jump
instruction indicates the jump destination to the other recording
layer.
When the recording information is, therefore, read out from the
DVD-ROM on which the information has been recorded on the basis of
the recording method, the jump instruction as mentioned above
appears in the read signal (RF signal) which is generated from the
pickup.
If the read signal is, therefore, directly used and an illegal copy
is tried to a DVD-R having the recording surface of only one layer
or a DVD-RAM, the jump instruction is intermittently mixed into the
information data. In this instance, since the other recording
layers do not exist in the single-layer disc such as a DVD-RAM
(DVD-R), if the jump instruction as mentioned above is reproduced
at the time of the information reproduction, the normal
reproduction is not performed.
That is, according to the invention, the illegal copy from the
multilayer disc (DVD-ROM) to the single-layer disc (DVD-RAM, DVD-R)
directly using the read signal (RF signal) which is generated from
the pickup can be prevented.
In the embodiment, although the next data block is recorded just
after each jump instruction, it is also possible to insert a noise
image signal which generates an inharmonious feeling into a
boundary between a jump instruction and a data block and to record
a resultant signal. In this case, on the reproducing apparatus
side, after completion of the execution of the jumping operation,
the read signal generated from the pickup is masked for only a
predetermined period (period of time during which the noise image
signal exists) and, thereafter, a reproducing process is executed.
If an illegal copy, therefore, is tried to the DVD-RAM (or DVD-R)
by directly using the read signal generated from the pickup, the
noise image signal is also copied and a more effective copy
prevention can be performed.
In the embodiment, by setting a boundary of each data block at a
position in the halfway of a GOP unit in the MPEG, the more
effective copy prevention can be realized.
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